摘要
为解决传统生物脱氮工艺存在的流程长、运行费用高、脱氮率低等问题,采用微电解法对高含氮废水脱氮处理进行研究.在原电池的基础上,用铁炭微电解法对NO2^--N进行还原到氮气,最终达到废水脱氮的目的.着重分析pH、m(Fe)/m(C)、反应时间、混凝条件等反应条件对NO2^--N和TN去除率的影响.同时,从经济效益方面与传统脱氮工艺进行分析比较.结果表明:微电解法控制进水pH为1.5-3.0,水力停留时间为60 min,m(Fe)/m(C)为1.1∶1.0,混凝pH为8.5-9.0和沉降时间为40 min时,NO2^--N的去除率可高达75%以上,TN的去除率可达52%左右.微电解法对各种高含氮废水的脱氮处理是切实可行的,并且用废刚玉粉末取代活性炭,可以获得以废治废的环境效益和经济效益.
Aiming at the long flow with high operating cost and low removal efficiency in traditional biological process of denitrification, the micro-electrolysis technology was employed to treat the ammonium-rich wastewater. The NO2^- -N was deoxidized to nitrogen gas by ferric-carbon micro-electrolysis based on the mechanism of galvanic battery, thus the nitrogen was removed from wastewater. The influence of reaction conditions, including pH, Fe/C (mass ratio), reaction time, and coagulation condition, on the removal rate of NO2^- - N and TN was analyzed. The results show that the removal rate of NO2^- - N is up to 75% and that of TN is about 52% with micro-electrolysis technology under following reaction conditions: pH. value of 1.5 - 3.0, reaction time of 60 min, Fe/C (mass ratio) of 1. 1 : 1.0, coagulation pH value of 8.5 - 9.0, and coagulation time of 40 min. Thus it is feasible to treat ammonium-rich wastewater by Ferric-Carbon Micro-Electrolysis. And using waste corundum graphite powder instead of activated carbon is using waste to treat waste, which can obtain favorable environmental and economic benefits.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2008年第8期1325-1328,共4页
Journal of Harbin Institute of Technology
基金
国家自然科学基金资助项目(50308004)
辽宁省教育厅高等学校科技计划项目(2004004)